Speed-limiting device.



PATENTED APR. 9, 1907.-

I an. STONE. SPEED LIMITING DEVICE. 7 APPLICATION FILED SEPT; 21. 1903.

2 SHEETS-$3331? 1.

Iqveryfior. v Fred 3.. "fine, by J 11 Atty.

Witnesses: l w

PATEN'I'ED APR. 9, 1907.

I. L. STONE.

SPEED LIMITING DEVICE.

APPLICATION FILED SEPT. 21, 1903.

I 2 SHEEN-SHEET 2.

Wiifqesses:

MMA

l REA If I WW a T all whom, it may concern.-

Limiting Devices, of

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Be it known that I, FRED L. STONE, asubjectof the King of Great Britain,residingat Schenectady, in the county of Schenectady and State of NewYork, have invented certain new and useful Improvements in Speedwhichthe following is a specification.

The present invention relates to speedlimitingdevices, and moreparticularly to that class of speed-limiting devices which operatethrough the making or breaking of an electric circuit to actuate powerregulating or controlling mechanism.

My inventionhas for its object to provide a device of this characterwhich is adapted to be applied with facility to complete machines ofvarious types non-cloggable by grease and dirt, positive and sensitivein action, and of low cost of manufacture. In the accompanying drawings,forming a part of this specification, I have shown a particularembodiment of my invention.

Figure 1 is a vertical longitudinal section of a speed-limiting deviceshown in connection with ,a shaft and bearing of an ordinary electricmotor. Fig. 2 is a side elevation of the same. Fig. 3 is a transversesection on the line 3 3 of Fig. 2, and Fig. 4 is a left hand elevationof the stationary contacts and their support. 4

I The stationary contacts 1 and}? are connected in practicethrough thelead-wires 3 and 4: to suitable translating devices, (not shown,) bywhich the power applied tothe rotary machine is controlled or regulated.

The movable contact 5, by which the electric circuit is automaticallycompleted 'between the stationary contacts 1 and 2, is carried by aspring-pressed plunger 6, normally held in retracted position by latchmeans mounted to rotate with the rotary part A of 5 the machine andadapted to operate under centrifugal force to release the plunger when apredetermined speed is exceeded.

The contact 5 consists of a flat metallic disk and is secured to theplunger 6 by means of screws 7 and 8, extending through an interveningplate of insulation 9. The body part of the plunger 6' consists of ametallic cylinder having a peripheral notch or groove 10, a longitudinalside slot 11, and an axial cavit 12 into which extends a su i v P rat taApia 9,1901.

, ger is free to move longitudinally.

The stub-shaft-13 is provided on one side side slot- 11 of theplunger toprevent relative rotation of these parts, so that theplunger is causedto rotatewith the rotary part A of is provided with-a reduced outer end'21. upon which are pivoted a latch-lever l2 and a weighted lever 23,which are held thereon by a nut 2-1, engaging the outer threaded end ofthe reduced portion 21. The latch-lever '22 has one arm 25 bent inwardlyto enter the peripheral groove in'the plunger. and the other arm isextended beyond the plunger on the opposite side thereof from the end25, and'ahelical spring 26, surrounding the cylindrical post 18. engagesat its end with the attaching-plate 17 and the lever 22 and operates tohold the bent end 25of the lever pressed toward the plunger. 1 g

The weighted lever 23 is made with one end much heavier than theother,'s'o that as itrevolves the heavier end' will tend to move out-'wardly under centrifugal force. The lighter end 27 is offset into thepath of arm 25 of the latch-lever, so, that when the weighted end movesoutwardly the latch-lever will be engaged and forced out of the path ofthe plunger 6. The means for holding the weighted lever in its innerposition and for regulating f the force exerted thereon consists of ahelical spring 12%, secured to a projection 29 from the back of thelever and to a screw-eye 3 ext tending through the post '19 and engagedby a thumb-nut 31.

Thestationary contacts 1 and 2 comprise segmental strips of spring metalprovided with binding-screws 32 and are secured to a with a guide-pin14, which extends into the the machine, and when released the cont act-.

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porting'stub-shaft 13, upon which the plun- 7 described. that there arebut two parts-the .by Letters Patent of the United States, is

plate of insulation 33, held by screws 34 to one side of a support 35,having a parallel-sided I arm 36, extending through and adjustablysecured in an aperture of a bracket 3'7, bolted to the bearing-block orother stationary part B of the machine.

'I he means for returning the plunger 6 to 3' its retracted positionconsists of a push-rod 38, extending through the support 35 in line withthe axis of the plunger and provided at its inner end with a flat head39 and at its. outer end with a button 40. The support 35 is cored outat 4-1 for the reception of a helical retracting-spring 42 and theend ofthe button 40.

It is to be noted in the construction herein plate 17 and the bracket37requiring attachrnent in order to connect the device to any ordinaryshaft and its bearing, that the con struction of p arts is such thatexact centering is unnecessary, and that the action of the several partsis positive. i

I do not desire to restrict myself to the particular construction orarrangement of parts shown and f scribedhercin, since it apparout thatthey may be changed and modified without departing from my invention.

What I claim as new, and desire to secure 1. In a speed-limiting devicefor rotary machines, the combination of a stationary contact, aspring-pressed movable contact mounted to rotate with the machine,andposition and automatically releasing it upon apredetermined speedbeing exceeded.

In a speed-limiting device for rotary machines, the combination of astationary contact, a spring-pressed axially-movable contact mounted torotate with the machine, and latch means cont-rolled by centrifugal 5action for holding said movable contact in rei tracted. position andautomatically releasing it upon apredetennined speed being exceeded.

3. In a speed-limiting device for rotary machines, the combination of astationary contact, a spring-pressed axially-movable contact, a supportfor said movable contact having a feathered connection therewith andadapted to be operatively connected with the rotary element of themachine, and latch l seams means for holding said movable contact inretracted position and automatically releasingit upon a predeterminedspeed being exceeded.

i. In a speed-limiting device for rotary machines, the combination of astationary contact, a spring-pressed movable contact, a

latch mounted to rotate with the machine for holding said movablecontact in retracted position, and a centrifugal lever for tripping saidlatch.

In a speed-limiting device for rotary machines, the combination of astationary contact, a spring-pressed movable contact, a latch mounted torotate with the machine for holding said movable contact in retractedposition, and a spring-pressed centrifu a1 lever having a part extendinginto the pat of said latch whereby the latter is tripped upon apredetermined speed being exceeded.

6. In a speed-limiting device for rotary machines, the combination or" astationary contact, a spring-pressed axially-movable plunger having a'contact secured thereto, a latch mounted to rotate with the machine forengaging and holdingsaid plunger in retracted position, a centrifugallever having a part extended into the path of said latch, and adjustablespring means for holding said lever in its inner posit-ion.

7. In a speed-limiting device for rotary machines, the combination of astationary contact, a support therefor, a movable contact mounted torotate with the machine, and a push-rod carried by said support and.

adapted to engage and return said movable contact to its retractedposition.

8. In a speed-limiting device for rotary machines, the combination of astationary contact, means for support ng said contact in line with therotary'element, a movable contact carried by an xially-movablespringpressed plunger, centrifugallycontrolled latch means for holdingsaid plunger in retracted position, and e. push-rod carried by saidsupporting means for manually returning said plunger to its retractedposition.

In witness whereof i have hereunto set my hand this 19th day ofSeptember, 1903.

FRED L. STONE. 'itnesses:

G. C. HOLLISTER, HELEN ORFORD.

